Possible spoiler for you here, careful....
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. Killing everything in ust (whatever) will not be a bad thing, it won't make any diff, but give more xp. Silver dragon= you should go talk to her, return the eggs, and she will show you the way out... I( never did the evil aligned, yet - I'm in TOB w/ my first party) but will be going down there with them to do it differently. Soulafin (sp) does not retur in SOA, not sure yet about TOB.
Hope this helps
